The introduction of polymer banknotes saw the end of the customary Watermark.
It was replaced with a Variable Optical Security Device in the bottom corner.
The clear window [Optical Security Device] contains a stylised gum [eucalyptus] flower.

SerialNumbers

Two letter & Two number Prefix
AA00 – AB19

Notes :
The shading variance ranges from a light to a very dark green. The variances between colours
have been noticed in the same bundle of banknotes and they appear throughout the print series.